AN EXTENDED CORRESPONDING STATES MODEL FOR PREDICTING THERMODYNAMIC PROPERTIES OF THE N2-AR-O2 MIXTURE

A new model for the prediction of the thermodynamic properties of bina ry and ternary mixtures in the nitrogen-argon-oxygen system has been d eveloped using an extended corresponding states model. The model accur ately represents single phase mixture properties over a wide compositi on spectrum for liquid and vapor states for binary mixtures. The model also accurately predicts properties of the ternary mixture representi ng air. Heat capacities, entropies, and energies can be calculated usi ng the model. Nitrogen is used as a reference fluid for calculating mi xture properties. Estimates for the equivalent-substance reducing rati os for the mixture are calculated with van der Waals mixing rules. Emp irical temperature-dependent binary interaction parameters are used to improve the agreement of calculated mixture properties with available experimental binary P-rho-T-x data. Comparisons of calculated propert ies to available mixture data are summarized to verify the accuracies of predicted properties.